Like John said, check and segregate your cases. Handloading is more of a science than an "art". I would suggest purchasing several manuals from the various component vendors. Read and follow all that is presented. I have loaded thousands of rounds with no mishap.
We handloaders, as a rule, don't have access to the varied test
equipment that component and ammunition manufacturer's have.
Make no mistake regarding handloading;
it only takes ONE double charge, a momentary lack of attention,
scratching one's ass, etc. and TSHTF!
This is not a diatribe; rather a a hint towards safety. I am cautious
AND safe regarding handloading. It CAN cost less than factory ammunition and often does; however it allows one to match ammunition to a particular firearm; that is the beauty of it.
Illegitimi non Carborundum
“There are two types of people; those that try to get you to do something that you'd rather not, and all others.”